Transient absorption spectroscopy of the [Fe(2 CH3-phen)3]2+ complex: Study of the high spin ↔ low spin relaxation of an isolated iron(II) complex

Geoffrey Gallé (1) , Gediminas Jonusauskas (1) , Marc Tondusson (1) , Cindy Mauriac (2) , Jean-François Letard (2) , Eric Freysz (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We report on the light induced spin crossover dynamics of [Fe(2 CH3-phen)3]2+ complex in solution. The excitation of the complex by pulses centered at λ = 500 nm along the metal to ligand charge transfer absorption band indicates a selective excitation of the LS state. The excitation of the complex by pulses centered at λ = 330 nm or λ = 335 nm reveals an increase of the LS state population and a photo-bleaching of the HS state population that is associated to a transient photo-dissociation. A method that makes it possible to deduce the kinetics of both the HS → LS state and LS → HS state is proposed.

Domaines: Chimie théorique et/ou physique; Chimie de coordination

Geoffrey Gallé, Gediminas Jonusauskas, Marc Tondusson, Cindy Mauriac, Jean-François Letard, et al.. Transient absorption spectroscopy of the [Fe(2 CH3-phen)3]2+ complex: Study of the high spin ↔ low spin relaxation of an isolated iron(II) complex. Chemical Physics Letters, 2013, 556, pp.82-88. ⟨10.1016/J.CPLETT.2012.11.034⟩. ⟨hal-00788820⟩